Tools Required

J 8087  Cylinder Bore Gauge. See Special Tools and Equipment .

1. Clean the following components:
   • Use solvent to clean the engine block.
   • Clean the gasket surfaces.
   • Clean the coolant passages.
   • Clean the oil passages.
2. Inspect the following for cracks:
   • Inspect the cylinder walls for cracks.
   • Replace the engine block if any cracks are evident.
   • Inspect the coolant jackets for cracks.
   • Replace the engine block if any cracks are evident.
   • Inspect the main bearing insert cavities for cracks.
   • Replace the engine block if any cracks are evident.
3. Inspect for the following in the cylinder walls:
   • Inspect for gouges in the cylinder walls deeper than 0.05 mm (0.002 in).
   • Bore the cylinder if gouges are deeper than 0.05 mm (0.002 in).
   • Inspect for pitting in the cylinder walls deeper than 0.05 mm (0.002 in).
   • Bore the cylinder if pitting is deeper than 0.05 mm (0.002 in).
   • Inspect for scores is the cylinder walls deeper than 0.05 mm (0.002 in).
   • Bore the cylinder if scores are deeper than 0.05 mm (0.002 in).
Fig 1: Measuring Cylinder Bore
Courtesy of GENERAL MOTORS CORP.
4. Use the J 8087  to measure the cylinder bore at the directed points (1, 2) for the following conditions:
   • Measure for wear.
   • Measure for taper.
   • Measure for runout.
   • Measure for ridging.
5. The cylinders with less than 0.05 mm (0.002 in) of wear and/or taper may be reconditioned.
6. Recondition the cylinders with less 0.05 mm (0.002 in) with a hone and fitted with the appropriate size select fit piston (providing the cylinder was not fitted with the largest size select fit piston).